On the origin of event-related potentials indexing covert attentional selection during visual search: timing of selection by macaque frontal eye field and event-related potentials during pop-out search.
نویسندگان
چکیده
Event-related potentials (ERPs) have provided crucial data concerning the time course of psychological processes, but the neural mechanisms producing ERP components remain poorly understood. This study continues a program of research in which we investigated the neural basis of attention-related ERP components by simultaneously recording intracranially and extracranially from macaque monkeys. Here, we compare the timing of attentional selection by the macaque homologue of the human N2pc component (m-N2pc) with the timing of selection in the frontal eye field (FEF), an attentional-control structure believed to influence posterior visual areas thought to generate the N2pc. We recorded FEF single-unit spiking and local field potentials (LFPs) simultaneously with the m-N2pc in monkeys performing an efficient pop-out search task. We assessed how the timing of attentional selection depends on task demands by direct comparison with a previous study of inefficient search in the same monkeys (e.g., finding a T among Ls). Target selection by FEF spikes, LFPs, and the m-N2pc was earlier during efficient pop-out search rather than during inefficient search. The timing and magnitude of selection in all three signals varied with set size during inefficient but not efficient search. During pop-out search, attentional selection was evident in FEF spiking and LFP before the m-N2pc, following the same sequence observed during inefficient search. These observations are consistent with the hypothesis that feedback from FEF modulates neural activity in posterior regions that appear to generate the m-N2pc even when competition for attention among items in a visual scene is minimal.
منابع مشابه
Title : On the Origin of Event - Related Potentials Indexing Covert Attentional 1 Selection During Visual Search : Timing Of Selection by Macaque Frontal Eye Field
متن کامل
On the origin of event-related potentials indexing covert attentional selection during visual search.
Despite nearly a century of electrophysiological studies recording extracranially from humans and intracranially from monkeys, the neural generators of nearly all human event-related potentials (ERPs) have not been definitively localized. We recorded an attention-related ERP component, known as the N2pc, simultaneously with intracranial spikes and local field potentials (LFPs) in macaques to te...
متن کاملOn the origin of event - related potentials indexing covert attentional 1 selection during visual search
Jeremiah Y. Cohen, Richard P. Heitz, Jeffrey D. Schall, Geoffrey F. Woodman 3 Department of Psychology, Vanderbilt Vision Research Center, Center for Integrative and 4 Cognitive Neuroscience, Vanderbilt Brain Institute, Vanderbilt University, Nashville, Tennessee 5 Address for reprint requests and other correspondence: J. D. Schall, Department of Psychology, 6 Vanderbilt University, PMB 407817,...
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عنوان ژورنال:
- Journal of neurophysiology
دوره 109 2 شماره
صفحات -
تاریخ انتشار 2013